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Transcoding previews in the archive index

When archiving e.g. HD video changing resolution and codec of the preview file can create a smaller archive index. This example uses qt_tools to demonstrate the process. Of course other tools like Compressor or Episode can also be used.

The result of this example is generation of H.264 and AAC ISO MPEG-4 files (.mp4, mp4a). In the scripts the length of the preview is set to 120sec but can be changed there. The preview files will temporarily be stored at /PresSTORE_Proxies/output P4 picks them up from there and deletes them afterwords.